docs: def process_document(self, doc):
          """
          Add your code for processing the document
          """
  
          raw = doc.select_segments("$.raw_content")[0]
  
          doc.store(doc.extract(self.content_extractor, raw, strategy=Strategy.ALL_TEXT), "etk2_text")
          doc.store(doc.extract(self.content_extractor, raw, strategy=Strategy.MAIN_CONTENT_STRICT),
                                "etk2_content_strict")
          doc.store(doc.extract(self.content_extractor, raw, strategy=Strategy.MAIN_CONTENT_RELAXED),
                                "etk2_content_relaxed")
          doc.store(doc.extract(self.metadata_extractor,
                                raw,
                                extract_title=True,
                                extract_meta=True,
                                extract_microdata=True,
                                extract_rdfa=True,
                                ), "etk2_metadata")
          return list()